Improvement in stop-motions tor silk-stretching and winding machines



@anni @Mira DUNHAM,v OF LEEDS, MASSACHUSETTS.

Leners Patent No. 92,944, daad July 27, 1869.

IMPROVEMENT IN STOP-MOTIONS FQR SILK-STRETCHING- AND WINDINC-i- MACHINES.

The Schedule referred to in these Letters Patent and making peut of the 6eme.

To -all whom it may concern:

Be it known that I, P. DUNHAM,- of Leeds, Hampshire county, Commonwealth of Massachusetts, have invented a new and useful Machine for Stretching Silk; and I do hereby declare that the following is a full and clear description thereof,4 reference being had to the accompanying drawings, and tothe letters of reference marked thereon.

In the drawings- Figure 1 is a side sectional view, and

Figure 2 is a front view of my device.

This invention consists of a new and improved ldevice for stopping the motion of the stretchingfpulleys, in machines for stretching silk, before it is wound upon the bobbin finally.

In the drawings- A is the reel, from which the silk is wound to the bobbin G above it.

Between the reel and bobbin are pulleys B and B, geared together, byv means of the gears a and a", on their shafts, and the intermediate gear-wheelb onthe shaft of the operating-pulley D, 'which takes its motion from -the main shaft E of the machine, by means-of a belt, F.

The gears a and a are of the same size, and both being 'turned by the gear b, consequently move the pulleys B and B at the same rate of speed'.

It will be seen, however, that the pulleys B and B are differential ones, each having small grooves d and f, the ones, d,being cut into the Vpart of less diameter, and the ones, 'f, into parts of greater diameter.

Now, the thread, in Apassing from the reel tothe. bobbin, is passed intermediately around the pulleys B and B', in the following mannerfitrom the reel around the groove al of the pulleyT B', then around the corresponding part of the pulley B, then back again around the part f of the pulley Bf, and finally, around the same part of the pulley B, so that'it has to stretch in order to accommodate itself to the diiixerent sizes of the parts, the pulleys moving, as before stated, at the same speed. v

Shouldthe thread break, from any accidental cause,

the following device;

chine, so that the longer arm, h, rests upon the thread at a point between the two cross-hars j and j, over which the thread passes before it reaches the bobbin. Then the thread breaks, this arm falls from its position, and brings the shorter arm, k, with a hook on its end, in, the way of a catch on the pulley B, which clutches and stops the motion.

This catch Z .of -the pulley B is made with aspring, so that the machine is not stopped too suddenly.

it stretches better.

In this manner the silk is stretched evenly and fully without danger of breaking, exceptin the caseofiiaws in the fibre, and, in such a case, the machine is instantaneously stopped, without danger of breaking any of the operative parts by the sudden jarring which usually accompanies the ordinary stop-motions.

Now, having described my invention,

What I claim as-new, and desire to secure by Letters Patent, is-

The arrangement of the lever I, with hook-.arm k, upon the frame, and the spring-catch l upon the pulso that the breaking of the thread causes vthem to engage and stop the machine, as set forth.

P. DUNHAM.

Witnesses:

R. F. HYDE, E. H. HYDE.

in this operation,l the machine is stopped by means ci" A lever, I, is pivoted, at g', to the frame of the mal l The silk is generally kept wet upon the reel, so that ley B or its shaft, all substantially as described, and 

